55215357 has 8 divisors (see below), whose sum is σ = 73994976. Its totient is φ = 36622992.

The previous prime is 55215343. The next prime is 55215361. The reversal of 55215357 is 75351255.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55215357 - 2¹⁴ = 55198973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55210357) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46123 + ... + 47304.

It is an arithmetic number, because the mean of its divisors is an integer number (9249372).

Almost surely, 2^55215357 is an apocalyptic number.

It is an amenable number.

55215357 is a deficient number, since it is larger than the sum of its proper divisors (18779619).

55215357 is a wasteful number, since it uses less digits than its factorization.

55215357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93627.

The product of its digits is 26250, while the sum is 33.

The square root of 55215357 is about 7430.7036678904. The cubic root of 55215357 is about 380.7909586873.

It can be divided in two parts, 5521 and 5357, that added together give a triangular number (10878 = T₁₄₇).

The spelling of 55215357 in words is "fifty-five million, two hundred fifteen thousand, three hundred fifty-seven".